CN116457677A - Disconnection inspection device and disconnection inspection method for electrode tabs of battery cells - Google Patents
Disconnection inspection device and disconnection inspection method for electrode tabs of battery cells Download PDFInfo
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- CN116457677A CN116457677A CN202280007221.4A CN202280007221A CN116457677A CN 116457677 A CN116457677 A CN 116457677A CN 202280007221 A CN202280007221 A CN 202280007221A CN 116457677 A CN116457677 A CN 116457677A
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- 238000007689 inspection Methods 0.000 title claims description 136
- 238000000034 method Methods 0.000 title claims description 48
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 230000002950 deficient Effects 0.000 claims description 48
- 238000005259 measurement Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 8
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000002591 computed tomography Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000000611 regression analysis Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The disconnection inspecting apparatus for an electrode tab of a battery cell according to the present invention includes: a measuring unit that measures an impedance value and an impedance angle according to a frequency of a battery cell to be inspected; a calculation unit that calculates a real part resistance value of impedance according to a frequency of a battery cell to be inspected, from the impedance value and the impedance angle; and a determination unit that checks whether or not the electrode tab of the battery cell to be checked is disconnected by comparing the real part resistance value in the real part resistance value range of the battery cell of good quality in the same type as the battery cell to be checked with the real part resistance value of the impedance of the battery cell to be checked in the same frequency range as the resonance frequency range.
Description
Technical Field
The present invention relates to an apparatus and a method for checking the disconnection of an electrode tab of a battery cell for non-destructive checking of the disconnection of an electrode tab of a target battery cell.
The present application claims priority from korean patent application No.10-2021-0104021 filed on 8/6 of 2021, and the entire contents of which are incorporated herein by reference.
Background
Recently, secondary batteries capable of being charged and discharged are widely used as energy sources for wireless mobile devices. In addition, secondary batteries have attracted attention as energy sources for electric vehicles, hybrid electric vehicles, and the like, which have been proposed as solutions for solving air pollution of existing gasoline vehicles, diesel vehicles, and the like using fossil fuel. Accordingly, various applications using the secondary battery have been diversified due to the advantages of the secondary battery, and the secondary battery is expected to be applied to even more fields and products in the future.
Such secondary batteries may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, and the like according to the compositions of electrodes and an electrolyte, wherein the use of lithium ion polymer batteries, which have a small possibility of electrolyte leakage and are easy to manufacture, is increasing. Generally, secondary batteries are classified according to the shape of a battery case, including cylindrical and prismatic batteries in which an electrode assembly is mounted in a cylindrical or prismatic metal can, and pouch-shaped batteries in which an electrode assembly is mounted in a pouch-shaped case formed of an aluminum laminate sheet. An electrode assembly mounted in a battery case is formed in a structure including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, is a power generating element capable of charge and discharge, and is classified into a jelly-roll type in which the separator is interposed between the positive electrode and the negative electrode coated with an active material having a long sheet shape and wound, and a stacking type in which a plurality of positive electrodes and a plurality of negative electrodes having a predetermined size are sequentially stacked in a state in which the separator is interposed therebetween.
Fig. 1 is a schematic view showing a position where the electrode tab 13 of the pouch-shaped battery cell 10 is broken.
As shown, the electrode assembly 12 is mounted in the battery case 11 of the pouch-type battery cell 10, and the electrode tab 13 is taken out of the electrode assembly 12 and welded to the electrode lead 14. Since the welded portions of the electrode tabs and the welded portions of the electrode tabs and the electrode leads receive forces in various directions during the manufacturing process of the battery cell, disconnection 15 may occur at one or more of the welded portions. When the disconnection occurs, a defect such as a low voltage may be caused.
In order to detect disconnection of the electrode tab, conventionally, as in patent document 1, a method of pressing a battery cell and measuring an impedance change according to the pressing or physically checking a welding position by capturing a Computed Tomography (CT) image has been used.
In the technique of patent document 1, since a separate pressing device that presses the battery cell is required to measure the impedance change, it is difficult to apply the method to mass production level inspection.
In addition, in the case of taking a CT image, since it takes about 1 minute and 30 seconds to inspect each battery cell, mass production level inspection is impossible.
Therefore, there is a need to develop a battery cell electrode tab disconnection inspection technique in which the battery cells are not pressed and do not require a long time to inspect, and which can be rapidly performed at a mass production level.
[ Prior Art ]
[ patent literature ]
Korean patent laid-open publication No.10-2020-0035594
Disclosure of Invention
Technical problem
An object of the present invention is to provide an apparatus and method for checking disconnection of an electrode tab of a battery cell, which are capable of checking disconnection of an electrode tab in a short time.
Technical proposal
An apparatus for checking disconnection of an electrode tab of a battery cell according to the present invention, the apparatus comprising: a measurement unit that measures an impedance value and an impedance angle according to a frequency of an inspection target battery cell; a calculation unit that calculates a real part resistance value of impedance according to a frequency of the inspection target battery cell from the impedance value and the impedance angle; and a determination section that determines whether or not an electrode tab of the battery cell is disconnected by comparing a real part resistance value in a real part resistance value range in a resonance frequency range of a good battery cell of the same type as the inspection target battery cell with a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range.
As one example, the determination portion may determine that the electrode tab of the inspection target battery cell is disconnected when a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than a real part resistance value in the real part resistance value range of the good battery cell in the resonance frequency range.
As an example, the measuring part may be an electrochemical impedance spectroscopy EIS instrument.
As a specific example, when a portion of the real part resistance value range of the good battery cell within the resonance frequency range overlaps with a change line of the real part resistance value of the defective battery cell or the real part resistance value range of the defective battery cell within the same frequency range as the resonance frequency range, the determination section may check whether the electrode tab of the inspection target battery cell is disconnected by comparing the real part resistance value of the good battery cell within the real part resistance value range including or not including the overlapping change line or range with the real part resistance value of the inspection target battery cell.
As another example, the determination part may determine whether the electrode tap of the inspection target battery cell is disconnected by determining a real part resistance value in a real part resistance value range of the good battery cell based on frequency data of the resonance frequency range and real part resistance value data in the resonance frequency range of the good battery cell and comparing the real part resistance value in the real part resistance value range of the good battery cell with the real part resistance value of the inspection target battery cell.
Furthermore, the apparatus for checking disconnection of the electrode tabs of the battery cells may further include a storage part in which information about at least one of the resonance frequency ranges of the plurality of battery cells, the real part resistance value ranges of the good battery cells within the resonance frequency ranges, and the correlation between the real part resistance values and frequencies within the resonance frequency ranges is stored.
A method for checking disconnection of an electrode tab of a battery cell according to another aspect of the present invention, the method comprising the steps of: measuring an impedance value and an impedance angle according to the frequency of the inspection target battery cell; calculating a real part resistance value of impedance according to the frequency of the inspection target battery cell according to the impedance value and the impedance angle; and determining whether an electrode tab of the inspection target battery cell is disconnected by comparing a real part resistance value in a real part resistance value range in a resonance frequency range of a good battery cell of the same type as the inspection target battery cell with a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range.
The resonance frequency range of the good battery cells may be a range of frequencies including a change in imaginary resistance of a measured impedance value of each of a plurality of good battery cells from a positive (+) value to a negative (-) value.
As one example, the method may include the steps of: obtaining real part resistance value lines of good product impedance of the respective good batteries by connecting real part resistance values according to frequencies of each good battery cell in the resonance frequency range; and setting a real part resistance value region of the good battery cell adjacent to a real part resistance value line of good product impedance as the real part resistance value range within the resonance frequency range of the good battery cell.
Specifically, the step of determining may include: determining the inspection target battery cell as a defective product when a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value of the real part resistance value region of the good battery cell; and determining the inspection target battery cell as a good product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is less than or equal to the range of the real part resistance value region.
Alternatively, the step of determining may include: determining whether the inspection target battery cell is good or bad by comparing real resistance values in the real resistance value region of the good battery cell with real resistance values of the inspection target battery cell at three points of a minimum frequency, an intermediate frequency, and a maximum frequency within the resonance frequency range.
As a specific example, the method may include: obtaining a defective product real part resistance value line of each battery cell or a defective real part resistance value region adjacent to the real part resistance value line of the plurality of defective battery cells by connecting the real part resistance value of the frequency of each of the plurality of defective battery cells disconnected according to the electrode tab; and when the defective product real part resistance value line or the defective product real part resistance value region overlaps the real part resistance value region of the good battery cell, setting a range including or not including the overlapping region or line as a real part resistance value range of the good battery cell to determine whether the battery cell is good or bad.
As another example, the method may include: deriving a correlation between the real resistance value and frequency in the resonant frequency range from frequency data and real resistance value data in the resonant frequency range of the plurality of good battery cells; and setting a real part resistance value range within the resonance frequency range based on the derived correlation with the real part resistance value range within the resonance frequency range of the good battery cell.
As one example, the step of determining may include: determining the inspection target battery cell as a defective product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value based on the correlation in the resonance frequency range of the good battery cell; and determining the inspection target battery cell as a good product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is smaller than the real part resistance value range based on the correlation in the resonance frequency range of the good battery cell.
As another example, the step of determining may include: determining whether the battery cell is good or bad by comparing each real part resistance value of a good product expressed according to the correlation at three points of a minimum frequency, an intermediate frequency, and a maximum frequency of the resonance frequency range with real part resistance values of the inspection target battery cell at the three frequencies.
The step of determining may include: the inspection target battery cell is determined to be a defective product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value based on the correlation in the resonance frequency range of the good battery cell by a predetermined range or more.
Advantageous effects
According to the present invention, since disconnection of the electrode tab can be rapidly checked, mass production level checking can be performed. Further, due to the disconnection inspection of the present invention, defective battery cells can be prevented from being shipped.
Furthermore, according to the present invention, it is possible to rapidly inspect not only in the battery cell manufacturing stage but also in the recycling stage or the reuse stage in which the finished battery cell is reused after a certain period of use (disconnection of the electrode tab). Thus, when the battery cells are recovered, it is possible to determine whether to use the battery simply by rapidly checking the battery cells for defects.
Drawings
Fig. 1 is a schematic view showing a position where an electrode tab of a pouch-type battery cell is broken.
Fig. 2 is a graph showing an example of Nyquist plot (Nyquist plot) of battery cells.
Fig. 3 is a graph showing impedance values on a complex plane.
Fig. 4 is a schematic view showing an apparatus for checking disconnection of an electrode tab of a battery cell of the present invention.
Fig. 5 is a flowchart showing a procedure of setting a real part resistance value range of a good battery cell to which the method for checking disconnection of an electrode tab of a battery cell of the present invention is applied.
Fig. 6 is a graph for describing a process for obtaining a real part resistance value range and determining whether a battery cell is good or bad by a method for checking disconnection of an electrode tab according to an embodiment of the present invention.
Fig. 7 is a graph for describing a process for obtaining a real part resistance value range and determining whether a battery cell is good or not according to a method for checking disconnection of an electrode tab according to another embodiment of the present invention.
Detailed Description
Hereinafter, the present invention will be described in detail. First, terms and words used in the present specification and claims should not be construed as limited to meanings or meanings commonly used in dictionaries, and should be interpreted by meanings and concepts consistent with the technical scope of the present invention based on the principle that the inventor has properly defined the concepts of the terms to describe the present invention in the best way.
In this application, it should be understood that terms such as "comprises" or "comprising" are intended to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, and they do not preclude the presence or addition of one or more other features or integers, steps or operations, elements, components, or groups thereof. Further, when a portion (e.g., a layer, film, region, plate, etc.) is referred to as being "on" another portion, this includes not only the case where the portion is "directly on" the other portion, but also the case where the other portion is interposed therebetween. On the other hand, when a portion (e.g., a layer, film, region, plate, etc.) is referred to as being "under" another portion, this includes not only the case where the portion is "directly under" the other portion, but also the case where the other portion is interposed therebetween. Further, disposing "on" in this application may include disposing at the bottom and the top.
Meanwhile, in the present specification, the "longitudinal direction" is a direction in which the electrode leads of the battery cells protrude.
When the electrode tabs of the battery cells are disconnected as shown in fig. 1, it is estimated that the impedance value of the battery cells may change. In view of this, patent document 1 discloses a method of detecting whether or not disconnection has occurred by pressing a battery cell and measuring a change in impedance.
However, as described above, the present invention aims to detect whether disconnection occurs based on impedance without applying pressure. Even when the impedance change occurs due to the disconnection, since the impedance is a value that changes according to the frequency, a frequency to test whether the disconnection occurs based on the impedance should be specified.
The resonant frequency is the frequency at which the reactive component of the impedance is zero. That is, the resonance frequency is a frequency at which the imaginary component of the impedance is zero. The resonant frequencies of the battery cells are not 100% identical, but vary according to the shape, chemical composition, and type of the battery cells. That is, the resonant frequency of the battery cell is one parameter that is indicative of a characteristic or physical property of the battery cell. Accordingly, the inventors have predicted that it is possible to observe a change in the physical characteristics of the battery cells by measuring the impedance at the resonance frequency. Disconnection of the electrode tabs of the battery cells may also be an example of a change in physical characteristics. The invention proceeds from the insight that, when obtaining the impedance value of a good battery cell at the resonance frequency, at which the electrode tabs are not disconnected, it is possible to check quickly and simply whether the electrode tabs are disconnected by comparing the impedance value with the impedance value of the battery cell targeted for checking.
Fig. 2 is a graph showing an example of a nyquist plot of battery cells. When small AC signals with different frequencies are applied to a particular battery cell using an impedance measurement device, such as an Electrochemical Impedance Spectrometer (EIS), a nyquist plot as shown in fig. 2 may be obtained. However, although the actual points measured by the EIS instrument are limited to the number of frequencies, a plot as shown in fig. 2 can be obtained by appropriate curve fitting. In this case, the resonance frequency is the frequency of the point where the imaginary resistance of the impedance is zero. That is, when the impedance of the battery cell is measured using the EIS meter, the frequency at which the imaginary resistance of the impedance value changes from a positive (+) value to a negative (-) value (or vice versa) is the resonance frequency. That is, in fig. 2, the impedance Rs is an impedance at the resonance frequency, i.e., a real part resistance value.
Fig. 3 is a graph showing impedance values shown on a complex plane. As shown in fig. 3, the real part resistance Rs of the impedance is represented as |z|cos θ. The precondition of the invention is to obtain the range of the resonance frequency (resonance frequency range) of the good battery cell and extract the real part resistance value range of the good battery cell in the resonance frequency range. In a state where such resistance value data of good products is provided, when the real part resistance value according to the frequency of the inspection target battery cell 10 is obtained and compared with the real part resistance value of good products in the same frequency range (resonance frequency range), defective products (i.e., battery cells in which disconnection occurs in the electrode tabs) can be easily inspected.
Hereinafter, the present invention will be described in detail.
Fig. 4 is a schematic view showing an apparatus for checking disconnection of an electrode tab of a battery cell according to the present invention.
The electrode tab disconnection inspection device 100 for a battery cell 10 according to the present invention includes: a measurement unit 110 that measures an impedance value and an impedance angle according to the frequency of the inspection target battery cell 10; a calculation unit 120 that calculates a real part resistance value Rs of impedance according to the frequency of the inspection target battery cell 10 from the impedance value and the impedance angle; and a determination section that determines whether or not the electrode tab of the inspection target battery cell 10 is disconnected by comparing the real part resistance value Rs in the real part resistance value range in the resonance frequency range of the good battery cell of the same type as the inspection target battery cell 10 with the real part resistance value Rs of the impedance of the inspection target battery cell 10 in the frequency range same as the resonance frequency range.
The electrode tab disconnection inspection device 100 of the present invention includes a measurement section 110. The measurement section 110 may be an EIS meter. According to the EIS apparatus, impedance parameters of various frequencies can be obtained as described above. For example, impedance Z, reactance X, impedance angle θ, voltage, temperature, etc. can be obtained. Furthermore, it is also possible to check the resonance frequency, which is the frequency of the point at which the sign of the reactance (which is the imaginary resistance) changes. The measurement section 110 may measure the impedance value and the impedance angle according to the frequency of the inspection target battery cell 10.
Further, the electrode tab disconnection inspection device 100 of the present invention includes a calculation section 120 that calculates a real part resistance value Rs of the impedance according to the frequency of the inspection target battery cell 10 from the impedance value and the impedance angle. When the impedance Z and the impedance angle θ are known, the real part resistance value Rs can be obtained by the above equation rs= |z|cos θ. That is, a plurality of real part resistance values Rs can be obtained from the change in frequency.
The present invention includes a determination section that compares the real part resistance value Rs of the impedance of the inspection target battery cell 10 with the real part resistance value Rs of the good battery cell in the real part resistance value range in the resonance frequency range. A good product real part resistance value range in the resonance frequency range of a good battery cell of the same type as the inspection target battery cell 10 has been obtained in advance using an EIS instrument. The setting of the good product real part resistance value range will be described below in connection with the method for checking the disconnection of the electrode tabs of the battery cells of the present invention.
In order to check whether the electrode tab is disconnected, the real part resistance value Rs is selected from the real part resistance values Rs of the inspection target battery cell 10 in the same frequency range as the resonance frequency range of the good battery cell. Since the inspection target battery cell 10 is the same battery cell as the good product type, the resonance frequency of the inspection target battery cell 10 is likely to be within the resonance frequency range of the good product. However, the resonance frequency of the inspection target battery cell 10 may not be within the resonance frequency range according to the internal state of the battery cell. However, in the present invention, since the real part resistance value data of the good product verified by the plurality of good battery cells is compared with the real part resistance value data of the inspection target battery cell 10, the resonance frequency of the inspection target battery cell 10 does not have to be within the resonance frequency range of the good product. That is, among the frequencies of the measurement inspection target battery cell 10, when the frequency range of the measurement inspection target battery cell 10 is identical to the resonance frequency range of the good product, the frequency range is acceptable, and when the real part resistance value Rs of the impedance of the inspection target battery cell 10 in the frequency range is compared with the real part resistance value range of the good product, it can be quickly determined whether the electrode tab of the inspection target battery cell 10 is disconnected. In this case, since only the real part resistance value in the specific frequency range of the inspection target battery cell 10 measured by the EIS instrument is compared with the preset good product real part resistance value range, it is not necessary to press the battery cell. Therefore, whether the battery cell is disconnected can be simply checked by an algorithm or a calculation program that performs measurement using the measurement section 110, calculates the real part resistance value Rs using the calculation section 120, and performs comparison using the determination section 130. In this regard, since the electrode tab opening inspection device 100 of the present invention can rapidly perform inspection at a level applicable to mass production, the electrode tab opening inspection device 100 is very advantageous for factory automation.
As a specific example, there is a case where a part of the real part resistance value range of the good battery cell in the resonance frequency range overlaps with the real part resistance value of the defective battery cell in the same frequency range as the resonance frequency range or a change line of the real part resistance value range of the defective battery cell. That is, the real resistance value range of a good product is not necessarily completely distinguished from the real resistance value Rs of a defective product. The overlap of the real resistance value range between the good product and the defective product becomes severe in the low frequency range, as described below. However, as will be described below, in the resonance frequency range, the overlap is much smaller, which is also the reason for comparing the real part resistance Rs in the resonance frequency range.
The determination part 130 may check whether the electrode tab of the inspection target battery cell 10 is disconnected by comparing the real part resistance value Rs in the real part resistance value range including the overlapping variation line or the overlapping range excluding the good battery cell with the real part resistance value Rs of the inspection target battery cell 10. For example, in the case of a battery cell in a field where the quality standard is strict and a very high safety level is required, whether or not disconnection occurs is checked by comparing only a good product real part resistance value range of a good product (the range excluding a range overlapping with a resistance value range of a defective product or a change line of a real part resistance value) with a real part resistance value Rs of the inspection target battery cell 10. In this case, although a battery cell having good quality may also be regarded as a defective product and discarded, a battery cell having overlapping real part resistance values Rs is also regarded as a defective product when safety is prioritized.
On the other hand, in the case of a battery cell in the field where a relatively high quality standard and a relatively high safety are not required, from the viewpoint of product productivity, whether disconnection occurs is checked by considering all products having a good product real part resistance value Rs in an overlapping range as being included in a good product range. In this case, although it is possible to determine a defective battery cell in which disconnection occurs as a good product, the productivity and safety are weighted and compared, and the possibility is accepted.
On the other hand, the determination section 130 may check whether the electrode tab of the inspection target battery cell 10 is disconnected by comparing the real part resistance value Rs in the real part resistance value range of the good battery cell derived based on the correlation between the frequency data of the resonance frequency range of the good battery cell and the real part resonance value data in the resonance frequency range with the real part resistance value Rs of the inspection target battery cell 10. For example, pieces of real part resistance value data may be obtained for a plurality of frequencies of each good battery. In this case, when the frequency data and the impedance value data are plotted on the coordinate plane, several scattered data points will be displayed. For example, a linear regression analysis may be used to obtain a correlation between frequency data and real-part resistance value data. When such a correlation is obtained, a function or correlation may be derived over the resonance frequency range of the plurality of battery cells. Then, since the real part resistance value range of the good product according to the single correlation is compared with the real part resistance value range of the inspection target battery cell, it is possible to more quickly and accurately inspect whether disconnection has occurred. A more detailed description thereof will be provided in connection with the method for checking disconnection of an electrode tab of the present invention.
The electrode tab breakage inspection apparatus 100 of the present invention may further include a storage section 140, the storage section 140 storing information on at least one of a resonance frequency range of the plurality of battery cells, a real part resistance value range of the good battery cell in the resonance frequency range, and a correlation between the frequency and a real part resistance value Rs in the resonance frequency range. As shown in fig. 4, the storage section 140 may be provided as a type of a server or Database (DB) separate from the determination section 130 (see fig. 4A). Alternatively, the storage section 131 may be included as a type of memory in the determination section 130 (see fig. 4B).
As shown in fig. 4, whether or not disconnection has occurred can be rapidly checked by measuring the impedance value and the impedance angle according to the frequency of the inspection target battery cell 10 using the measuring section 110, calculating the real part resistance value Rs according to the frequency from these values using the calculating section 120, and comparing the real part resistance value Rs in the real part resistance value range in the resonance frequency range of the good battery cell with the real part resistance value Rs in the same frequency range of the inspection target battery cell 10 using the determining section 130. Each of the calculation section 120 and the determination section 130 may be a calculation device that controls a hardware implementation including a calculation device such as a Central Processing Unit (CPU) or a Micro Controller Unit (MCU) and a storage device such as a hard disk by using predetermined software, and the calculation section 120 and the determination section 130 are set to communicate with each other. Further, according to the embodiment, the calculating section 120 and the determining section 130 may also be implemented as one processor.
Hereinafter, a method for checking disconnection of the electrode tabs of the battery cells according to the present invention will be described.
The method for checking disconnection of an electrode tab of the present invention includes: measuring an impedance value and an impedance angle according to the frequency of the inspection target battery cell; calculating a real part resistance value Rs of impedance according to the frequency of the inspection target battery cell according to the impedance value and the impedance angle; and determining whether the electrode tab of the inspection object battery is disconnected by comparing the real part resistance value in the real part resistance value range in the resonance frequency range of the good battery cell of the same type as the inspection object battery cell with the real part resistance value of the impedance of the inspection object battery cell in the frequency range same as the resonance frequency range.
First, as shown in fig. 2, when the inspection target battery cell is connected to the measuring part 110 such as an EIS meter, an impedance value and an impedance angle according to the frequency of the inspection target battery are measured. As described above, since the EIS apparatus can measure various parameters related to impedance, the EIS apparatus can measure an impedance value and an impedance angle.
Next, a real part resistance value Rs of the impedance according to the frequency of the inspection target battery cell is calculated from the impedance value and the impedance angle. For example, the calculating part 120, which is installed with a predetermined calculating program, may mechanically and automatically calculate the real part resistance value Rs of the impedance according to the frequency of the inspection target battery cell through a predetermined equation shown in fig. 3.
Finally, it is determined whether the electrode tab of the inspection object battery is disconnected by comparing the real part resistance value Rs in the real part resistance value range in the resonance frequency range of the good battery cell of the same type as the inspection object battery cell with the real part resistance value Rs of the impedance of the inspection object battery cell in the frequency range same as the resonance frequency range.
In this determination, the real part resistance value Rs in the real part resistance value range in the resonance frequency range of the good battery cell of the same type as the inspection target battery cell is compared with the real part resistance value of the inspection target battery cell. Thus, information about the resonance frequency range of a good battery cell and information about the real resistance value range of a good product in the resonance frequency range are required. Furthermore, the method of determining whether a break has occurred may vary somewhat depending on what type of good product real resistance value range is obtained.
This information should be obtained in advance before the inspection of the inspection target battery cell. Hereinafter, the acquisition of information, a method for checking disconnection or a determination method related to the acquisition of such information will be described.
Fig. 5 is a flowchart showing a procedure of setting a real part resistance value range of a good battery cell to which the method for checking disconnection of an electrode tab of a battery cell of the present invention is applied.
First, the impedance value and the impedance angle of a plurality of good battery cells (electrode tabs of the battery cells are not disconnected) are measured while changing the frequency. As described above, this process may be performed using an EIS instrument. Thereby, the above-described impedance parameter can be obtained.
Thereafter, the resonant frequency of each battery cell is extracted to derive the resonant frequency range of the plurality of good battery cells. In this case, the resonance frequency range of the good battery cell is a range including a frequency at which the imaginary resistance of the measured impedance value of each of the plurality of good battery cells changes from a positive (+) value to a negative (-) value. Since the resonance frequencies are slightly different even when the battery cell types are the same, when the resonance frequency of each of the plurality of battery cells is obtained, the entire resonance frequency range is obtained. This is determined as the resonance frequency range of the corresponding good battery cell.
Next, the real resistance value Rs of the impedance of the plurality of good battery cells is calculated from the impedance value and the impedance angle by the equation of fig. 3.
Furthermore, a real part resistance value range of the good battery cell in the resonance frequency range is set according to the resonance frequency range and the calculated Rs value.
Two embodiments related to the setting of the real part resistance value range will be described below. The method for checking disconnection may vary in each embodiment.
Form for carrying out the invention
(first embodiment)
Fig. 6 is a graph for describing a process for obtaining a real part resistance value range and determining whether a battery cell is good or bad by a method for checking disconnection of an electrode tab according to an embodiment of the present invention.
As shown in fig. 6, the real resistance value Rs according to the frequency f of each good battery cell in the resonance frequency range may be connected to obtain a good product impedance real resistance value line of each battery cell. In the present embodiment, the real part resistance value Rs according to the frequency f of ten good battery cells is obtained, and the real part resistance value R is connected as a line.
In this case, the real resistance value region of the good battery cell in which the good product impedance real resistance value line is adjacent may be a real resistance value range within the resonance frequency range of the good battery cell. In fig. 6, a good product area is shown at frequency f. However, at low frequencies, as described below, since there are many regions overlapping with the real part resistance value region of the defective product, only the real part resistance value range in the resonance frequency range is limited to the good product real part resistance range for the turn-off inspection.
In this case, in checking the real part resistance value Rs of the target battery cell, the real part resistance value in the same frequency range as the resonance frequency range is compared with the real part resistance value of the real part resistance value region of the good battery cell in the resonance frequency range of fig. 6. When the former is larger than the latter, the inspection target battery cell may be determined to be a defective product, and when the former falls within the range of the latter or less, it may be determined that the inspection target battery cell is a good product.
Alternatively, in the determination, whether the battery cell is good or bad may be determined by comparing the real resistance value Rs of the real resistance value region of the good battery cell and the real resistance value Rs of the specific battery cell at three points of the minimum frequency, the intermediate frequency, and the maximum frequency in the resonance frequency range. That is, since the resonance frequencies of ten good battery cells span a range (resonance frequency range), comparison between real part resistance values Rs at one point within the range may decrease reliability. Therefore, it is determined whether the battery cell is good or bad by comparing the real part resistance value Rs of the good battery cell at three points of the minimum frequency z, the intermediate frequency y, and the maximum frequency x in the resonance frequency range of fig. 6 with the real part resistance values Rs of the inspection target battery cell at the same three frequency points as the frequencies.
Although it is desirable that the real resistance value range of the good product and the real resistance value range of the defective product do not overlap, in practice, there may be overlapping ranges as shown in fig. 6. For example, in a plurality of (five) defective battery cells each of which has an electrode tab open, the defective product real part resistance value line of each battery cell or the defective product real part resistance value region adjacent to the real part resistance value line of the plurality of defective battery cells may be obtained by connecting the real part resistance values according to the frequency f of the battery cells. As shown in fig. 6, the real resistive value region of the defective product overlaps much with the good product region at low frequencies. However, as shown, in the resonance frequency range, the real resistance value Rs in the defective product real resistance value region is relatively clearly distinguished from the real resistance value Rs of the good product region, and only some of the real resistance value Rs in the defective product real resistance value region overlaps with the real resistance value Rs of the good product region. In this case, as described above, the range of determining a good product based on the real part resistance value Rs can be determined by weighting and comparing viewpoints of quality standards, safety, and productivity. As shown in the enlarged view of fig. 6, when quality and safety are important, a defective product real part resistance value line or a portion B where a defective product real part resistance value region overlaps with a real part resistance value region of a good battery cell is not included, and whether the inspection target battery is good or not is determined by comparing a real part resistance value (region) C under the portion B with a real part resistance value Rs of the inspection target battery cell. When the quality standard is not strict and productivity is considered, it is determined whether or not the inspection target battery cell is good by comparing the entire good product real part resistance range including the portion B and the real part resistance value (region) C with the real part resistance value Rs of the inspection target battery cell.
(second embodiment)
Fig. 7 is a graph for describing a process for obtaining a real part resistance value range and determining whether a battery cell is good or bad by a method for checking disconnection of an electrode tab according to another embodiment of the present invention.
Similar to fig. 6, the present embodiment is characterized in that the real part resistance value range of the good battery is simplified by a statistical technique such as regression analysis to simplify the disconnection inspection, instead of combining the real part resistance value lines at the resonance frequency of the respective good battery cells.
That is, as shown in fig. 6, the frequency data and the real part resistance data of a plurality of (e.g., 10, 100, or 1000) good battery cells within the resonance frequency range are plotted on a coordinate plane having a frequency-real part resistance value Rs. In this case, as the number of battery cells increases, the dispersion of data points marked with points as coordinates may also increase. Based on this data, a relational equation that appropriately reflects the data can be derived with the frequency f as an argument and the real part resistance value Rs as an argument. That is, the correlation between pieces of data can be deduced by regression analysis. The relational equation may be one of various functions such as a linear function, a quadratic function, another polynomial function, an exponential function, and a logarithmic function.
As described above, the correlation between the frequency in the resonance frequency range and the real part resistance value Rs is derived, and based on the derived correlation, the real part resistance value region in the resonance frequency range is defined as the real part resistance value range in the resonance frequency range of the good battery cell.
Referring to fig. 7, a correlation between frequency data and real resistance data for ten good battery cells is shown.
Therefore, in the inspection object battery cell, when the real part resistance value Rs of the impedance of the inspection object battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value based on the correlation of the good battery cell in the resonance frequency range, the inspection object battery cell may be determined as a defective product, and when the real part resistance value Rs of the impedance of the inspection object battery cell in the same frequency range as the resonance frequency range is less than the real part resistance value range based on the correlation in the resonance frequency range of the good battery cell, the inspection object battery cell may be determined as a good product.
Specifically, it is possible to determine whether the inspection target battery cell is good or bad by comparing the good product real part resistance values r, q, and p, which are expressed as correlations at three points of the minimum frequency z, the intermediate frequency y, and the maximum frequency x within the resonance frequency range, with the real part resistance values Rs of the specific battery cell at the three frequency points.
Alternatively, in the determination, when the real part resistance value of the impedance of the specific battery cell in the same frequency range as the resonance frequency range is greater than the correlation-based real part resistance value of the good battery cell in the resonance frequency range by a predetermined range or more, the inspection target battery cell may be determined as a defective product. Since regression analysis models pieces of data, errors (residual errors and estimated standard errors) inevitably occur between actual measurement data and data according to correlation equations. Thus, when the real part resistance value of the single functional relation shown in fig. 7 is compared with the real part resistance value of the inspection object battery cell, and the real part resistance value of the inspection object battery cell is larger than the real part resistance value of the good battery cell in the resonance frequency range by a certain range (e.g., a statistically generated error range), the inspection object battery cell may be determined as a defective product. This is similar to excluding good product regions from the real resistance value range that overlap with the real resistance value of the defective product region in the embodiment of fig. 6 to determine whether a break occurs. Therefore, it is possible to more strictly check whether the electrode tabs of the battery cells are disconnected.
As described above, in the present invention, it is possible to rapidly check whether the electrode tab of the battery cell is disconnected even without pressing the battery cell. That is, by using a conventional impedance meter such as an EIS meter and a predetermined statistical technique, it is possible to quickly and simply check whether the electrode tabs of the battery cells are disconnected only by comparing with the real part resistance value of the good battery cells.
Furthermore, according to the present invention, it is possible to rapidly check not only in the battery cell manufacturing stage but also defects (disconnection of electrode tabs) in the battery cell in the recycling stage or the reuse stage (the finished battery cell is reused after a certain use time). Therefore, when the battery cell is recovered, it is possible to simply determine whether to use the battery by checking for defects of the battery cell.
The above description is merely an example describing the technical spirit of the present invention, and those skilled in the art may make various changes, modifications and substitutions without departing from the essential features of the present invention. Accordingly, the embodiments disclosed in the present invention are considered in descriptive sense only and not for purposes of limitation, and the scope of the invention is not limited by the embodiments. It is to be understood that the scope of the invention is defined by the appended claims, and all modifications and equivalents that fall within the scope of the claims are intended to be embraced therein.
In addition, in the present specification, although terms indicating directions such as upward, downward, leftward, rightward, forward, backward, etc. have been used, these terms are for convenience of description only, and it is clear that the directions are changed according to the position of a target object or an observer.
(reference numerals)
10: battery cell
11: battery case
12: electrode assembly
13: electrode joint
14: electrode lead
15: disconnecting
100: battery cell electrode joint disconnection inspection equipment
110: measuring part
120: calculation unit
130: determination part
131. 140: and a storage unit.
Claims (16)
1. An apparatus for checking disconnection of an electrode tab of a battery cell, the apparatus comprising:
a measurement unit that measures an impedance value and an impedance angle according to a frequency of an inspection target battery cell;
a calculation unit that calculates a real part resistance value of impedance according to a frequency of the inspection target battery cell from the impedance value and the impedance angle; and
and a determination section that determines whether or not an electrode tab of the battery cell is disconnected by comparing a real part resistance value in a real part resistance value range in a resonance frequency range of a good battery cell of the same type as the inspection target battery cell with a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range.
2. The apparatus according to claim 1, wherein the determination portion determines that the electrode tab of the inspection target battery cell is open when a real part resistance value of an impedance of the inspection target battery cell in a frequency range identical to the resonance frequency range is greater than a real part resistance value in the real part resistance value range in the resonance frequency range of the good battery cell.
3. The apparatus of claim 1, wherein the measurement portion comprises an electrochemical impedance spectroscopy EIS instrument.
4. The apparatus according to claim 1, wherein the determination section checks whether the electrode tap of the inspection target battery cell is disconnected by comparing the real part resistance value of the good battery cell in a real part resistance value range including or excluding an overlapping variation line or range with the real part resistance value of the inspection target battery cell when a part of the real part resistance value range of the good battery cell in the resonance frequency range overlaps with a variation line of the real part resistance value of a defective battery cell or the real part resistance value range of the defective battery cell in the same frequency range as the resonance frequency range.
5. The apparatus according to claim 1, the determining section checks whether the electrode tap of the inspection target battery cell is disconnected by determining a real part resistance value in a real part resistance value range of the good battery cell based on frequency data of the resonance frequency range and real part resistance value data in the resonance frequency range of the good battery cell and comparing the real part resistance value in the real part resistance value range of the good battery cell with a real part resistance value of the inspection target battery cell.
6. The apparatus according to claim 1, further comprising a storage section in which information about at least one of the resonance frequency ranges of a plurality of battery cells, the real part resistance value ranges of the good battery cells within the resonance frequency ranges, and correlation between real part resistance values and frequencies within the resonance frequency ranges is stored.
7. A method for checking disconnection of an electrode tab of a battery cell, the method comprising the steps of:
measuring an impedance value and an impedance angle according to the frequency of the inspection target battery cell;
calculating a real part resistance value of impedance according to the frequency of the inspection target battery cell according to the impedance value and the impedance angle; and
Determining whether an electrode tab of the inspection target battery cell is disconnected by comparing a real part resistance value in a real part resistance value range in a resonance frequency range of a good battery cell of the same type as the inspection target battery cell with a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range.
8. The method of claim 7, wherein the resonant frequency range of the good battery cells is a range of frequencies when an imaginary resistance value of an impedance value measured for each of a plurality of good battery cells changes from a positive (+) value to a negative (-) value.
9. The method according to claim 8, comprising the steps of:
obtaining real part resistance value lines of good product impedance of the respective good batteries by connecting real part resistance values according to frequencies of each good battery cell in the resonance frequency range; and
setting a real part resistance value region of the good battery cell adjacent to a real part resistance value line of a good product impedance as the real part resistance value range in the resonance frequency range of the good battery cell.
10. The method of claim 9, wherein the determining step comprises:
determining the inspection target battery cell as a defective product when a real part resistance value of an impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than a real part resistance value of the real part resistance value region of the good battery cell; and
and determining the inspection target battery cell as a good product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is less than or equal to the range of the real part resistance value region.
11. The method of claim 9, wherein the determining step comprises: determining whether the inspection target battery cell is good or bad by comparing each real resistance value in the real resistance value region of the good battery cell with each real resistance value of the inspection target battery cell at three points of a minimum frequency, an intermediate frequency, and a maximum frequency within the resonance frequency range.
12. The method according to claim 9, comprising the steps of:
Obtaining a defective product real part resistance value line of each battery cell or a defective real part resistance value region adjacent to the real part resistance value lines of the plurality of defective battery cells by connecting the real part resistance value of each of the plurality of defective battery cells disconnected according to the electrode tab; and
when the defective product real part resistance value line or the defective product real part resistance value region overlaps with the real part resistance value region of the good battery cell, a range including or not including an overlapping region or line is set as the real part resistance value range of the good battery cell to determine whether the battery cell is good or bad.
13. The method according to claim 8, comprising the steps of:
deriving a correlation between the real resistance value and frequency in the resonant frequency range from frequency data and real resistance value data in the resonant frequency range of the plurality of good battery cells; and
setting a real part resistance value range in the resonance frequency range based on the deduced correlation with the real part resistance value range in the resonance frequency range of the good battery cell.
14. The method of claim 13, wherein the determining step comprises:
determining the inspection target battery cell as a defective product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value based on the correlation in the resonance frequency range of the good battery cell; and
and determining the inspection target battery cell as a good product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is smaller than the real part resistance value range based on the correlation in the resonance frequency range of the good battery cell.
15. The method of claim 13, wherein the determining step comprises: determining whether the battery cell is good or bad by comparing each real part resistance value of a good product expressed according to the correlation at three points of a minimum frequency, an intermediate frequency, and a maximum frequency of the resonance frequency range with each real part resistance value of the inspection target battery cell at the three frequencies.
16. The method of claim 13, wherein the determining step comprises: the inspection target battery cell is determined to be a defective product when the real part resistance value of the impedance of the inspection target battery cell in the same frequency range as the resonance frequency range is greater than the real part resistance value of the good battery cell in the resonance frequency range by a predetermined range or more based on the correlation.
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| KR10-2021-0104021 | 2021-08-06 | ||
| PCT/KR2022/011408 WO2023014056A1 (en) | 2021-08-06 | 2022-08-02 | Disconnection testing device and disconnection testing method for electrode tab of battery cell |
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| JP5278508B2 (en) * | 2011-07-25 | 2013-09-04 | 横河電機株式会社 | Battery degradation determination apparatus and method |
| KR101841577B1 (en) * | 2016-06-29 | 2018-05-04 | 고려대학교 산학협력단 | System and method for diagnosing rotor defects of squirrel cage induction motor |
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| KR20200035594A (en) | 2018-09-27 | 2020-04-06 | 주식회사 엘지화학 | Non-destructive method for detecting disconnection of battery cell using pressing force |
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